as you certainly know my main interest is AROS and it is open. I do not know if there is any support regarding Zune but I am not involved there so I cannot say.
I know that there were a lot of bashings and negativ emotions between expecially devlopers of AmigaOS and MorphOS. But whatever the reasons are and who has caused it and is to blame the result is that all 3 platforms are similar but in details very different so that most developers are only supporting one platform in the end. Examples are differences in GUI (MUI4, Zune, MUI3.9/Reaction), RTG (Cybergraphics3, Cybergraphics5, P96). The list is endless and if you dig a little and compare even similar things are solved different and of course incompatible. At the end it forces developers to decide for one platform.